Chaffinch
Sophie Davies
12/11/2020
1 Introduction
The chaffinch is one of the most widespread and abundant bird in Britain and Ireland, (“RSPB,” n.d.). Monitoring of the phenotype of species is important for the species and can give indication changes in phenotypic plasticity or genetic variation, (Blackburn et al. 2013).
This data looks at the differences in mass between the male chaffinch, 1.1 and the female chaffinch, 1.2.
Figure 1.1: Male Chaffinch, By Andreas Trepte - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=15264293
Figure 1.2: Female Chaffinch, By 4028mdk09 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=20640633
2 Methods
Importing and summarising the data from chaff.txt.
3 Results
## # A tibble: 2 x 5
## sex mean n sd se
## <chr> <dbl> <int> <dbl> <dbl>
## 1 females 20.5 20 2.14 0.107
## 2 males 22.3 20 2.15 0.108## Df Sum Sq Mean Sq F value Pr(>F)
## tidy_chaff$sex 1 32.22 32.22 7.007 0.0118 *
## Residuals 38 174.73 4.60
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1## Tukey multiple comparisons of means
## 95% family-wise confidence level
##
## Fit: aov(formula = tidy_chaff$mass ~ tidy_chaff$sex)
##
## $`tidy_chaff$sex`
## diff lwr upr p adj
## males-females 1.795 0.422266 3.167734 0.0117504
(#fig:visualising results)Mean mass of male and female chaffinches
4 Discussion
References
Blackburn, Tim M, Melanie J Monroe, Becki Lawson, Phillip Cassey, and John G Ewen. 2013. “Body Size Changes in Passerine Birds Introduced to New Zealand from the UK.” NeoBiota 17 (June): 1–18. https://doi.org/10.3897/neobiota.17.4841.